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Sci. Ch 7 Unit Test
PHYSICAL SCIENCE
| Question | Answer |
|---|---|
| A device that increases or decreases the voltage in a power line is called a_____. | Transformer |
| Current that does not reverse direction is called______. | Direct Current |
| In a step up transformer the number of turns of wire is greater in the____coil than in the_____coil and the_____voltage exceeds the______voltage. | 1. Secondary 2. Primary 3. Output 4. Input |
| The location of the strongest magnetic forces on a magnet are the______. | Magnetic Poles |
| The region around a magnet where the magnetic forces act is the____. | Magnetic Field |
| Objects that keep their magnetic properties are called_______. | Permanent Magnets |
| An instrument that measures electric current is a______. | Galvanometer |
| A reversing switch that rotates the coil in an electric motor and reverses the direction of the current of every half turn is a______. | Commutator |
| The function of an electric motor is to______. | Is to change electrical energy to mechanical energy |
| The function of a generator is to______. | Change mechanical energy to electrical energy |
| A______attacks iron objects. | Magnet |
| The strength of magnetic force of an electromagnet is______by increasing the current in the coil. | Increased |
| Groups of atoms with aligned magnetic poles are called_____. | Magnetic Domains |
| _______is the process of producing an electric current by moving a loop of wire through a magnetic field. | Electromagnetic Induction |
| The atoms in a magnetic are_______. | According to their magnetic poles |
| Increase voltage | step up transformer |
| Alternating current is transmitted across large distances at high voltage to minimize_______. | Energy loss as heat |
| In a concept map describing the magnetic domain the atoms in a permanent magnet should be described as________. | Aligned |
| In a concept map concerning the strength of a magnetic field of an electromagnet the strength can be shone as able to be increased by______. | Increasing the amount of current |
| He would use a_______to decrease the voltage. | Step-Down-Transformer |
| What serves as the energy source and what kind of energy does it provide? | Battier and electrical |
| Does the figure represent an electric motor or a generator? (Motor) | because it goes from electrical to mechanical |
| What happens to the rotation if the current flowing through it is increased. | Increase the current |
| How are Windmills sometimes not reliable? | Wind doesn't always blow |
| How is alternating current different from direct current? | Alternating current reverses its current and direct current stays in one direction. |
| is a spiny thing inside of a permanent magnet. | Electromagnet |
| Transformers (Chart) | Characteristics, Step Up, Step down/ Influence or voltage, increases, decreases/ Coil with most turns, Secondary, Primary |
Created by:
P.V.A.
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